Shorter paths to HAL, ExtUI (#17156)

Marlin/src/libs/buzzer.cpp

@@ -28,7 +28,7 @@
 #include "../module/temperature.h"
 
 #if ENABLED(EXTENSIBLE_UI)
-  #include "../lcd/extensible_ui/ui_api.h"
+  #include "../lcd/extui/ui_api.h"
 #endif
 
 Buzzer::state_t Buzzer::state;

Marlin/src/libs/stopwatch.cpp

@@ -25,7 +25,7 @@
 #include "../inc/MarlinConfig.h"
 
 #if ENABLED(EXTENSIBLE_UI)
-  #include "../lcd/extensible_ui/ui_api.h"
+  #include "../lcd/extui/ui_api.h"
 #endif
 
 Stopwatch::State Stopwatch::state;